JP2840611B2 - Non-destructive inspection method and inspection device for contents of package - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention determines an abnormality in a content without destroying a package containing a fluid article such as a liquid or paste-like article. TECHNICAL FIELD The present invention relates to a method and an apparatus for inspecting the contents of a package for destruction for the purpose of performing the inspection.

The package is shaken under predetermined conditions to irradiate ultra soft X-rays from the outer surface of the package while maintaining the resonance between the package contents and the package container, and the transmitted X-ray dose is measured. Immediately after starting the shaking by applying vibration to the package under a predetermined condition or immediately after stopping the vibration, or by irradiating ultra soft X-rays from the outer surface of the package,
The dose is grasped with a dosimeter, and the presence / absence of the density change per unit volume based on the mixing condition of the space other than the contents in the packaging container (hereinafter referred to as head space) and the contents, and the magnitude of the contents are determined. This is to determine the presence or absence of physical property abnormality or the degree of physical property abnormality.

(Prior Art) It is important for quality control of a product to know whether there is an abnormality in physical properties of a content filled in a packaging container, in particular, whether there is a change in the content of a food or the like. Conventionally, as this type of inspection equipment, there has been a beating method for checking the quality of the contents of cans for deterioration, etc.Other than for canning, the container is vibrated and the difference between normal and abnormal is visually observed from fluctuations in the liquid level of the contents. Or non-destructive inspection by image analysis. For example, JP-A-63-167249 and JP-A-63-271146 disclose, after shaking a package to be inspected, irradiating ultra soft X-rays from the outer surface of the package to obtain image information. There has been proposed a method and an apparatus for judging the presence or absence of alteration of the contents or the degree of alteration based on the dispersion state of the head space in the video. However, when the above-described method and apparatus cannot be used, an appropriate number of packages are sampled, and after opening, it is determined whether or not there is a physical property abnormality.

(Problem to be Solved by the Invention) In the conventional nondestructive inspection method, the percussion inspection method can be used only for canning. In addition, the method of observing the fluctuation of the liquid level after shaking the container can be used only when the container is transparent. However, in general, many packaging containers are opaque and the range of use is extremely narrow.

Further, JP-A-63-167249 and JP-A-63-271146 described above.
In the case of the above method, when a video signal is obtained from transmitted X-rays, an afterimage remains on the screen in the case of a fluorescent image. Therefore, when inspection is performed continuously, it is necessary to wait until the afterimage disappears. In addition, when a negative film image is formed, the inspection ability is limited due to the necessity of development time and the like.

Since each of the above methods and devices requires human intervention, such as visual observation, there is a great limitation on the improvement of efficiency and accuracy, and the difficulty of interposing on fully automatic lines is a serious problem due to its nature. Had become a point.

(Means for Solving the Problems) According to the method for inspecting the contents of a package of the present invention, a package filled with a fluid content in a packaging container is shaken under predetermined conditions, and the content of the package is compared with the content of the package. Ultra-soft X-rays are radiated from the outer surface of the package while maintaining the resonance state of the package with the packaging container, the transmitted X-ray dose is grasped by a dosimeter, or the package is vibrated under predetermined conditions. Immediately after starting the shaking or stopping the vibration, the outer surface of the package is irradiated with ultra soft X-rays, the transmitted X-ray dose is grasped by a dosimeter, and the head space and the contents are checked. It is characterized in that the presence / absence of the density change per unit volume and the magnitude of the change based on the degree of mixing are used to determine the presence / absence of physical property abnormality of the contents or the degree of physical property abnormality. A technique for using a signal from a dosimeter obtained by ultra-soft X-ray irradiation to determine the presence or absence of physical property abnormality of the content and the degree of the abnormality based on the mixed state of the headspace and the content has not yet been known.

The physical property abnormality in the above refers to abnormal concentration, abnormal viscosity, abnormal composition, bacterial defects in foods and pharmaceuticals, and the like.

That is, according to the present invention, a package having fluidity in a packaging container and filled with contents having normal physical properties is shaken under predetermined conditions, so that the article and the inside of the packaging container are shaken. Mixed with the gas, while maintaining the resonance state of the contents and the packaging container, by irradiating ultra-soft X-rays from the outer surface of the packaging body, measured values obtained by measuring the transmitted X-ray dose, Compare the measured value of the transmitted X-ray dose obtained by irradiating the soft X-ray while shaking the package to be inspected under the above-described predetermined conditions, and determine the difference between the two measured values. This is a nondestructive inspection method for the contents of a package, characterized by determining whether or not the physical properties of the contents of the package are abnormal or the degree of the abnormality. The present invention also provides a method for vibrating a package, which is a flowable article filled with contents having normal physical properties, in a predetermined condition for mixing gas in the packaging container with the article. Immediately after shaking or after stopping the vibration, the measured value of the transmitted X-ray dose obtained by irradiating ultra soft X-rays from the outer surface of the package and the package, which is the object to be inspected, are subjected to the predetermined Immediately after shaking by applying vibration under the conditions or immediately after stopping vibration, the measured value of the transmitted X-ray dose obtained by irradiating ultra-soft X-ray is compared. A method for non-destructively inspecting the contents of a package characterized by determining the presence or absence of physical property abnormality of the contents of the package, or the degree of the abnormality. In the above, the content is a liquid or paste-like article, and the gas is an inert gas such as air or nitrogen gas.

Further, the apparatus of the present invention includes a shaking device for a package, an ultra-soft X-ray irradiator facing the package on the device, and an X-ray detection mechanism opposed thereto, and the output of the X-ray detection mechanism is A nondestructive inspection device for the contents of a package, which is connected to a device for sorting the package. The X-ray detection mechanism described above is composed of a signal processing equipment for the dose detected by the X-ray dosimeter and a data logger for determining and recording the presence or absence of an abnormality.

As described above, the present invention improves on all the technical problems of the conventional inspection method, and also enables interposition on a fully automatic line.

Vibration conditions when the contents and the packaging container resonate most can be expressed from a vibration engineering point of view in a certain number range with the contents, density of the contents, viscosity of the contents, and physical properties of the packaging container as variables. . Therefore, in terms of physics, if these values are constant, the vibration condition at the time of resonance becomes constant. However, when the chemical properties of the contents are different (for example, a detergent solution and a saline solution having the same viscosity and the same density), when the package is shaken, the head space becomes fine bubbles and the foaming state of mixing into the contents is as follows. Completely different. Therefore, when the content is food, even if there is no change in viscosity due to decay by protein-degrading bacteria, etc., the foaming state differs from the normal product due to the change in physical properties due to degradation of protein, etc. When the vibration conditions at the time of resonating the product are close to each other (for example, foods in which special bacteria have propagated), the rate of disappearance of the foam after stopping the vibration is different from that of the normal product. Thus, the spoiled product can be detected.

Shaking a package containing a flowable article causes mixing between the headspace and the article. When shaking starts, the head space becomes fine bubbles from the part close to the packaging container surface and mixes with the contents, and when the contents and the packaging container resonate, the bubbles are evenly mixed up to the center of the contents. In addition, the density at the center of the package is the smallest. When the vibration energy is further increased from this state to the package, the package and the contents no longer resonate, and the mixing of foam at the center decreases.

In the inspection device, when the package is shaken, the package is deformed and the thickness of the part that transmits the ultra soft X-ray changes. To make it possible, the presser is specially processed according to the strength of the package.

Examples of the packaging material for the packaging container include metal foil, laminate of metal foil and plastic or (and) paper, single-layer or multi-layer plastic packaging material, metal-deposited film, paper, laminate of paper and plastic, and cloth. Those coated with a resin can be used. Examples of the secondary packaging material include the above-mentioned materials, cardboard, and kraft paper.

Examples of the form of the packaging container include various bags such as bottles, containers, bag-in-boxes, flat bags and self-standing bags, tubes, cartons, composite cans, paper cans, aluminum cans and the like.

The contents to be filled in the packaging container include food, medicine, feed, reagents, etc., and food and medicine are particularly important. The content may be in any form as long as it has fluidity, such as a uniform liquid, a dispersed liquid, and a paste.

According to the present invention, when inspecting a package in which the packaging container is filled with a fluid content, the package is maintained at a constant thickness at the center of the package to be irradiated with the ultra-soft X-ray. When shaken by mechanical means or manually, chaotic liquid level behavior occurs in the package. When the vibration energy is increased, the head space in the package (content space other than the content in the package) is dispersed in the content, and when a resonance phenomenon appears between the content and the packaging container, the dispersed head space is finely divided. It changes into a bubble and is uniformly mixed with the contents at the maximum resonance point to fill the package. In this state, or immediately after the stop of shaking, when ultra soft X-rays are irradiated from the outer surface of the package,
The density at the center of the package is lowest with uniform mixing of fine bubbles, and the transmitted X-ray dose is the highest. The packaging condition, the inner volume and the inner volume of the package are constant for the vibration conditions under which the maximum resonance occurs and the time from the start of shaking until the resonance becomes maximum, or the time from when the resonance is stopped until the bubbles disappear. If so, it changes in response to the change in the physical properties of the contents.
Therefore, in a package filled with contents having normal physical properties, the package filled with abnormal physical properties is shaken under the same vibration condition as the vibration condition under which the amount of transmitted X-rays is maximized. However, when the ultra soft X-ray is irradiated, the amount of X-ray transmitted through the central portion of the package is lower than that of the normal physical property product, so that the presence or absence of physical property abnormality and the degree of abnormality can be easily determined.

In the case of abnormal physical properties of the package and the normal product, if the vibration conditions at the time of maximum resonance between the contents and the packaging container and the time until the resonance becomes maximum after the start of vibration are approaching, Since there is a difference in the disappearance speed of the bubbles immediately after stopping the operation, the abnormality in the physical properties can be determined based on the difference in the X-ray transmission amount based on the difference. The ultra-soft X-ray in the above refers to an X-ray in a wavelength range close to ultraviolet rays, and is a name for distinguishing from an ordinary X-ray in a wavelength range close to γ-ray. The dosimeter that detects X-rays may be a dosimeter (for example, a scintillation counter) that can convert the X-ray dose into an electric signal (quantity), and the electric signal is differentiated from the standard output by an amplifying signal processing device. Is done.

(Action) The X-ray intensity transmitted through the object is attenuated by the increase in the density of the substance. The increase or decrease of the X-ray intensity is detected by the X-ray meter, so that the internal state of the packaged article can be determined. The X-ray dosimeter utilizes the fact that X-rays transmitted through an article are converted into a thin flux by a slit, and the X-rays are converted into light by a phosphor. The current is amplified by the electron multiplier and output. The higher the mixing ratio between the contents of the package and the foam, the lower the density, and the greater the dose of transmitted X-rays.

(Example 1) A polyethylene bottle having a diameter of 55 mm, a height of 165 mm and a wall thickness of 0.7 mm was filled with 250 ml of processed milk and sealed. Examples of the processed milk include those immediately after production (hereinafter, referred to as non-permuted products), those inoculated with unspecified bacterial strains after production, and allowed to stand at room temperature for 4 to 5 days (hereinafter, referred to as permuted products), and An unspecified strain is then inoculated and left at room temperature for 2 weeks (hereinafter referred to as late-stage altered product)
Was used. Ultra soft X-ray irradiator manufactured by Softex Corporation
The following tests were performed using SV-100A (maximum output 100KVP, 5mA).

While the various packages described above are placed on a shaker, and the package containing the non-perturbed product as a content is shaken under the most resonant vibration conditions,
Ultra soft X-ray irradiation was performed under the condition of an output of 55 KVP-3 mA, and the amount of X-ray transmitted through the center of the bottle was detected via an X-ray weighing device (R-1005) manufactured by Softex Corporation. As a result, the output of the dosimeter was 270 mV on average for the unaltered product, whereas the output of the former and the latter altered products was as low as 160 mV under the shaking conditions. The viscosity of the unaltered product is 2
At 1.8C at 0 ° C, the viscosity of the altered product is 1.50 to 247.5 at 20 ° C.
Some were in the range of 0CP and were almost the same as non-degraded products, but it was confirmed that they could be identified by the inspection method according to the present invention. In addition, these packaged materials are 7 μm thick aluminum laminated film, 15 μm thick aluminum laminated film, 20 μm thick.
The same result was obtained even when the test was carried out in a state of secondary packaging with a μm-thick aluminum laminated film and double flute cardboard (including the case of using both aluminum laminated film and cardboard).

(Example 2) Processed milk inoculated with an unspecified strain in Example 1 was used for 10 times.
The sample was stored in a refrigerator kept at a temperature of 6 ° C. for 6 weeks to be denatured, and an experiment was performed according to Example 1.

As a result, the output of the dosimeter had an average output of 25 mV for the non-altered product, whereas the output of most of the altered products was 170 mV or less. Output was obtained, and the time until resonance after starting vibration was close to that of the unaltered product. However, the output of the dosimeter 0.8 seconds after the stop of vibration was 0 mV for the non-transformed product (the same output as when there was no vibration),
The output of the deteriorated product shows a high value of 200 mV on average. If it is difficult to identify the deteriorated product in the resonance state,
It was identifiable by the dose difference obtained by irradiating the radiation.

(Example 3) 1000 ml of sterilized normal milk was aseptically filled and sealed in a paper container having a bottom surface of 95 mm x 63 mm and a height of 175 mm. A non-transformed product, a pre-transformed product, and a post-transformed product were prototyped using the same method as in Example 1, and a super soft x-ray irradiator (SV100A manufactured by Softex Corporation) was manufactured.
Type, maximum output 100KVP, 5mA) and X-ray meter (R-1005)
), And the same test as in Example 1 was performed. In addition, the material of the paper container is 15 μm thick polyethylene film / 2 from the outermost layer.
A composite material having a five-layer structure of 60 μm thick diplex paper / 25 μm thick polyethylene film / 7 μm thick aluminum foil / 45 μm thick polyethylene film was used.

As a result, the output of the dosimeter was 300 mV in the case of the non-permuted product, whereas it was 180 mV, which was the highest output in the former and later modified products, and could be differentiated. The viscosity of the unmodified product is 1.68 CP at 20 ° C, while the viscosity of the modified product is 1.45 ~
It was in the range of 255.50 CP, and some of the deteriorated products were hardly different from the non-degraded products in terms of viscosity, but it was confirmed that they could be identified by the inspection method according to the present invention. The same result was obtained even when the test was carried out in a state where this product was secondarily packaged with a double flute cardboard.

(Example 4) Baby food filled in aluminum cans (standard viscosity is 2.5C at 20 ° C)
Products having abnormal concentration (light) generated at the start of the production of P) were subjected to continuous detection test using the apparatus of the present invention. Super soft X
The irradiation and detection conditions were the same as in Example 1, and the shaking conditions were such that the package containing the standard product resonated most. As a result, a product having a viscosity of 20 ° C. and a concentration of 1.8 CP or less was able to be selected without malfunction.

Example 5 From the outermost layer to the innermost layer, a packaging bag made of a laminated film having a four-layer structure of 12 μm thick polyester film / 9 μm thick aluminum foil / 15 μm thick biaxially oriented nylon film / 70 μm thick polyethylene film (Pouch) was filled with 200 ml of potage soup and sealed. In addition, the potage soup immediately after production (hereinafter, referred to as a non-degraded product) is left at room temperature for 4 to 5 days after production (hereinafter, referred to as the predeteriorated product), and left at room temperature for two weeks after production (hereinafter, referred to as a non-degraded product). (Referred to as late-stage deteriorated product) was subjected to the experiment, and the same apparatus and method as in Example 1 were used, but the ultra soft X-ray output was 40 KVP-3 mA. As a result, compared to the output of the non-transformed product, the output obtained from the pre-transformed product and the post-transformed product was low, and the output difference was the smallest, about 50 mV, and the product could be sorted.

(Example 6) A plastic cup having an internal volume of 2 ml was filled with 1 ml of cream, and a test was performed according to Example 1. However, the output of the ultra-soft X-ray was 10 KVP-2 mA. As a result, compared with the output obtained from the unaltered product, the output of the first-stage and the second-stage altered products was lower, and the output difference was at least about 20 mV, and the products could be sorted.

(Example 7) A polyester bottle having a bottom of 70 mm x 40 mm, a height of 150 mm and a wall thickness of 0.5 mm was filled with 250 ml of black ink and immediately sealed, and after sealing, the lid was slightly loosened and left in a 30 ° C thermostat for 20 days. rear,
An experiment was performed according to Example 1 using a sealed container. However, the former was regarded as a normal product, the latter as an abnormal product, and the shaking conditions were such that the contents and the package resonated most in the normal product. The output of the ultra soft X-ray was 50 KVP-3 mA.

As a result, a resonance occurred between the packaging container and the contents of the normal product 2.25 seconds after the start of shaking, and the output of the dosimeter increased by about 50 mV.However, the abnormal product showed no resonance at 2.25 seconds after the start of shaking. And the dosimeter circumferential force was about the same as before shaking. Resonance
Woke up after 11.20 seconds.

Using an inspection apparatus using this product in Example 2, under the above-mentioned shaking conditions, the inspection by ultra-soft X-ray was performed 5 seconds after the start of shaking. As a result, a normal product and an abnormal product were clearly distinguished.

(Example 8) An experiment was carried out in accordance with Example 7 in order to confirm the quality of a 20 cc correction fluid contained in a vinyl chloride container. As a result,
Even if the coined product is shaken under the condition of normal product resonance,
No resonance phenomenon was observed, and the dosimeter output was the same as before shaking. Therefore, defective products could be identified by the inspection method according to the present invention.

Embodiment 9 Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

The inspection device according to the present invention includes a shaking device 2 for shaking the package 1 and a main inspection device 3. The main inspection device 3 is arranged independently of and parallel to the shaking device 2. Incorporating the shaking device 2 into the main inspection device 3 is because the vibration of the shaking device 2 is transmitted to the main inspection device 3 and the focus is shifted at the time of irradiation by the ultra-soft X-ray irradiating mechanism 4 and the X-ray sensor 5 is used. The signal appears to vary. Therefore, it is necessary to isolate the vibration from the shaking device 2 from the main inspection device 3.

The shaking device 2 includes a conveyor 9, a vibration generating mechanism 10, and members associated therewith. Conveyor 9
Is for placing the package 1 thereon and moving it downstream. The vibration generating mechanism 10 is for shaking the package 1 which is moved by the movement of the conveyor 9. The vibration generating mechanism 10 is an electrodynamic oscillator,
Various types of conventionally known types, such as a type using an attractive force of an electromagnet, a type using a vibration motor, and a type using a mechanical oscillator, can be used. The presser device 11 is for keeping the thickness of the package 1 moving on the conveyor 9 constant, and is provided in parallel with the upper side of the conveyor 9 (and both side surfaces). It is desirable that the presser device 11 be structured so as to be able to advance and retreat with respect to the conveyor 9 so that when it comes into contact with the package 1, it runs following the movement of the package 1, and a vibrating device for smooth shaking. It is desirable to resonate with 2.

The main inspection device 3 includes a super soft X-ray irradiation mechanism 4 and an X-ray detection mechanism 5, and the super soft X-ray irradiation mechanism 4
For irradiating ultra-soft X-rays to the surface. Further, the X-ray detection mechanism 5 incorporates an X-ray sensor 14, a signal processing mechanism 6, and a data logger 7. Ultra soft X-rays are X-rays in a wavelength range near ultraviolet rays, and are names for distinguishing from ordinary X-rays in a wavelength range near γ-rays. The X-ray sensor 14 is a mechanism that converts the X-rays transmitted through the package 1 into light with a fluorescent material, and amplifies and outputs the light as current with a photomultiplier tube and a preamplifier. The signal generated from the X-ray sensor 14 is
As a unique signal, the presence / absence and degree of abnormality are determined by the signal processing mechanism 6 and displayed and recorded on the data logger 7.

Further, in the apparatus of the present invention, a sorting mechanism 8 is provided at the end of the main inspection device 3 for discharging the package 1 determined as an abnormal product separately from the package 1 determined as a non-defective product. desirable. As the distribution mechanism 8, for example, the following mechanism is adopted.

As shown in FIG. 5, a second conveyor 13 is provided so as to be connected to the end side of the main inspection device 3, and one end of the second conveyor 13 is configured to be vertically movable, and is determined to be an abnormal product. When the package 1 moves to the second conveyor 13, one end of the package 1 is rotated downward to discharge an abnormal product.

Also, as shown in FIG. 6, a guide rail 15 is provided on the end side of the main inspection device 3 or on a second conveyor 13 provided continuously thereto, and by controlling the direction of the guide rail 15, This is a mechanism for guiding the flow of the package 1 determined as an abnormal product in a different direction from the flow of the package 1 determined as a normal product. In the figure, 16 is a package insertion conveyor, and 17 is an X-ray shielding plate.

As described above, the package inspected for one is automatically divided by the sorting mechanism 8 into a normal article and an abnormal article. A known device is used for the ultra-soft X-ray irradiation mechanism and its X-ray sensor, and the start and stop of the package are appropriately performed.

(Effects of the Invention) According to the present invention, the presence or absence of deterioration of the contents can be accurately determined without opening the package by the method and apparatus described above. Not only the presence / absence of abnormality but also the degree of abnormality can be determined, and there is no need for visual inspection, so there are various effects such as the ability to check the entire number of packages.
It is particularly useful in the food and pharmaceutical industries.

In addition, the device of the present invention is installed on an integrated production line,
Inspection can be performed with the same efficiency as other processing lines,
There is also the effect that it can be fully automated with high precision.

[Brief description of the drawings]

FIG. 1 is a partially sectional front view of an embodiment of the present invention, FIG. 2 is a partially sectional plan view of the same, and FIG. 3 is a main portion showing an example of a shaking device in the embodiment of the present invention. FIG. 4 is a block diagram of an abnormal product detection mechanism portion showing another example of the present invention, FIG. 5 is a partial front view of an embodiment of a selection mechanism, and FIG. It is. DESCRIPTION OF SYMBOLS 1 ... Package 2 ... Shaking device 3 ... Main inspection device 4 ... Super soft X-ray irradiation mechanism 5 ... X-ray detection mechanism 6 ... Signal processing mechanism 7 ... Data logger 8 Distributing mechanism 9 Conveyor 10, Vibration generating mechanism 11 Holding device 12, Resonance plate 13 Second conveyor 13a Second conveyor 14 X-ray sensor 15, Guide rail 16 …… Package insertion conveyor 17 …… X-ray shielding plate

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Toshitaka Kobayashi 1-2-1-3 Sakaecho, Higashimurayama-shi, Tokyo Meiji Dairies Co., Ltd. Central Research Laboratory (72) Inventor Masanori Nagata 1-4-16 Nihonbashi Bakurocho, Chuo-ku, Tokyo No. Fujimori Kogyo Co., Ltd. (72) Inventor Shigeki Konno 1-4-16 Nihonbashi Bakurocho, Chuo-ku, Tokyo No. Fujimori Kogyo Co., Ltd. (72) Inventor Hideaki Homma 4-22 Sakuragaokacho, Shibuya-ku, Tokyo Softex Corporation (72) Inventor Hideki Nishiyama 4-22 Sakuragaoka-cho, Shibuya-ku, Tokyo Inside Softex Corporation (58) Field surveyed (Int.Cl. ⁶ , DB name) G01N 9/24 G01N 11/00 G01N 23/10

Claims (5)

(57) [Claims] An object having fluidity in a packaging container and filled with contents having normal physical properties is shaken under predetermined conditions, and the article and gas in the packaging container are shaken. Are mixed, and while maintaining the resonance state between the contents and the packaging container, a measurement value obtained by irradiating ultra-soft X-rays from the outer surface of the packaging body and measuring a transmitted X-ray amount, Is compared with the measured value of the transmitted X-ray dose obtained by irradiating the ultra-soft X-ray while shaking the package under the predetermined conditions, and from the difference between the two measured values, the package of the object to be inspected is compared. A nondestructive inspection method for the contents of a package, characterized by determining whether or not the physical properties of the contents are abnormal or the degree of the abnormalities. 2. A package, which is a flowable article filled with contents having normal physical properties, is vibrated under a predetermined condition for mixing the gas in the packaging container with the article. Immediately after shaking or after stopping the vibration, the measured value of the transmitted X-ray dose obtained by irradiating ultra soft X-rays from the outer surface of the package and the package, which is the object to be inspected, are subjected to the predetermined Immediately after shaking by applying vibration under the conditions or immediately after stopping vibration, the measured value of the transmitted X-ray dose obtained by irradiating ultra-soft X-ray is compared. A method for inspecting the contents of a package for destruction, characterized by determining whether or not the physical properties of the contents of the package are abnormal or the degree of the abnormality. 3. The content is a liquid or paste-like article,
2. The gas according to claim 1, wherein the gas is an inert gas such as air or nitrogen gas.
Or the nondestructive inspection method of the contents of the package according to 2. 4. A shaking device for a package, an ultra-soft X-ray irradiator facing the package on the device, and an X-ray detection mechanism facing the soft X-ray, the X-ray detection mechanism comprising an X-ray meter A non-destructive inspection device for the contents of a package, comprising a signal processing equipment for the dose determined in step (1) and a data logger for determining and recording the presence or absence of an abnormality. 5. A package shaking device, and an ultra-soft X-ray irradiating the package on the device and an X-ray detecting mechanism facing the soft X-ray are provided. A non-destructive inspection device for the contents of a package, comprising a meter and an output connected to the device for sorting the package.